I have heated cast iron exhaust manifolds in the oven on broil that were hot enough that it did not crack when I welded on it so it can be done.
You won't be "chasing" across the part, so you don't have to drill the end. Though if it were mine I may drill and pin that the piece - prior to heating and welding.
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~JAG~
NCRS#65120
68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car
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